Feat config management

[boomballa]

Summary

This PR enhances DragonflyDB's INFO SERVER output to be more compatible with Redis, by adding several key fields.

Features

• INFO SERVER now reports the following fields, matching Redis output and order:
  • hz
  • process_id
  • executable
  • config_file
• These fields are now visible in the info server output, for example:

  # Server
  redis_version:7.4.0
  dragonfly_version:df-dev
  redis_mode:cluster
  arch_bits:64
  process_id:2396326
  os:Linux 5.10.0-32-amd64 x86_64
  thread_count:40
  multiplexing_api:iouring
  tcp_port:7379
  uptime_in_seconds:274
  uptime_in_days:0
  hz:80
  executable:/usr/bin/dragonfly
  config_file:/home/dba/dragonfly/dragonfly7379/dragonfly7379.cnf
  

Implementation Details

• Global variables for executable and config_file are set at startup and used for info reporting.
• hz is reported using the value of the FLAGS_hz flag.
• process_id is reported using getpid() for portability.
• No changes to CONFIG GET config_file or CONFIG REWRITE are included in this PR; those features will be submitted separately.
• All code comments are in English.

Compatibility

• Output is now more compatible with Redis for the INFO SERVER section.
• No breaking changes.

Checklist

• All commits are signed.
• PR title follows the conventional commit spec.
• Only necessary files are changed.
• All code comments are in English.

---

Closes: #3789

[boomballa]

Hey @romange , Roman here! I'm back again 😅 First off, I really appreciate your patience with my PR—sorry for the extra time spent on details. But I couldn't resist swinging by to chip in a little more for the project! 😄
If there's anything to improve, please cue me anytime !

[romange]

Thank you @boomballa 🙏🏼

[boomballa]

Hey @romange , thanks a bunch! With your suggestions and edits, this PR has become so much more concise. Really appreciate your help. I’ll be more mindful of code submission standards moving forward. Thanks again! 🙏

[kostasrim]

Hi @boomballa,

It looks like we have a crash in the tests. See https://github.com/dragonflydb/dragonfly/actions/runs/15992173518/job/45107833943?pr=5388

trace:

77: *** SIGABRT received at time=1751354741 on cpu 1 ***
77: PC: @     0x7f601d2c900b  (unknown)  raise
77:     @          0x142b38c         64  absl::lts_20240722::WriteFailureInfo()
77:     @          0x142b5fe        112  absl::lts_20240722::AbslFailureSignalHandler()
77:     @     0x7f601db4a420       5136  (unknown)
77:     @          0x1457e1a        256  absl::lts_20240722::raw_log_internal::RawLog()
77:     @          0x1457cd0         64  absl::lts_20240722::raw_log_internal::(anonymous namespace)::DefaultInternalLog()
77:     @          0x13bb0f0         96  absl::lts_20240722::base_internal::AtomicHook<>::operator()<>()
77:     @          0x13c8e5d        304  absl::lts_20240722::flags_internal::FlagImpl::AssertValidType()
77:     @           0x59de23         64  absl::lts_20240722::flags_internal::Flag<>::Get()
77:     @           0x598129         32  absl::lts_20240722::flags_internal::FlagImplPeer::InvokeGet<>()
77:     @           0x592bb3         32  absl::lts_20240722::GetFlag<>()
77:     @           0x7146dc        288  dfly::ServerFamily::FormatInfoMetrics[abi:cxx11]()::{lambda()#3}::operator()()
77:     @           0x71974d       1328  dfly::ServerFamily::FormatInfoMetrics[abi:cxx11]()
77:     @           0x71a9b5       2496  dfly::ServerFamily::Info()
77:     @           0x6fe77c         48  dfly::(anonymous namespace)::HandlerFunc()::{lambda()#1}::operator()()
77:     @           0x74e0ff         64  fu2::abi_400::detail::invocation::invoke<>()
77:     @           0x746ae0        112  fu2::abi_400::detail::type_erasure::invocation_table::function_trait<>::internal_invoker<>::invoke()
77:     @           0xd9cc53        112  fu2::abi_400::detail::type_erasure::tables::vtable<>::invoke<>()
77:     @           0xd9ccec        112  fu2::abi_400::detail::type_erasure::erasure<>::invoke<>()
77:     @           0xd9cd6a         80  fu2::abi_400::detail::type_erasure::invocation_table::operator_impl<>::operator()()
77:     @           0xd9962e        240  dfly::CommandId::Invoke()
77:     @           0x5fdf9f        624  dfly::Service::InvokeCmd()
77:     @           0x5fcfb0        528  dfly::Service::DispatchCommand()
77:     @           0x55fd9f        336  dfly::BaseFamilyTest::Run()
77:     @           0x55f664        160  dfly::BaseFamilyTest::Run()
77:     @           0x4b2502         96  dfly::BaseFamilyTest::Run()
77:     @           0x493b00        144  dfly::SearchFamilyTest_SearchStatsInfoRace_Test::TestBody()::{lambda()#2}::operator()()
77:     @           0x49f600         32  std::__invoke_impl<>()
77:     @           0x49dfd1         32  std::__invoke<>()
77:     @           0x49caa9         32  std::__apply_impl<>()
77:     @           0x49cae3         48  std::apply<>()
77:     @           0x49cb61         96  util::fb2::detail::WorkerFiberImpl<>::run_()
77:     @           0x49b993         80  util::fb2::detail::WorkerFiberImpl<>::WorkerFiberImpl<>()::{lambda()#1}::operator()()